1 files changed, 2 insertions, 0 deletions

diff --git a/src/keymap.c b/src/keymap.c
index f2152d17202..68c673380c8 100644
--- a/src/keymap.c
+++ b/src/keymap.c
@@ -1766,6 +1766,8 @@ spaces are put between sequence elements, etc.")
   else
     keys = wrong_type_argument (Qarrayp, keys);
 
+  if (len == 0)
+    return build_string ("");
   return Fconcat (len * 2 - 1, args);
 }